ROTTERDAM, Dec 9 (Reuters) - A Dutch court on Monday extended the detention of a Russian former employee of semiconductor equipment maker ASML (ASML.AS), opens new tab suspected of stealing intellectual property and selling it to buyers in Russia in violation of European sanctions.

The suspect is German Aksenov, a 43-year-old man who has worked for ASML subsidiary Mapper and chip technology company NXP (NXPI.O), opens new tab.

He is suspected of stealing design manuals for microchips, microchip equipment and for technology with potential military applications that belonged to ASML, Mapper, NXP and the Delft University of Technology, to which he had access through his employment.

During the initial hearing in the case on Monday, the prosecution said Aksenov took USB sticks with the information to Moscow and gave them to state-owned companies for cash, with the goal of setting up a microchip plant.